Drill Presses & Chucks
How to drill a hole Drill bits, reamers & counter bores
The chucks supplied with most tradesman drill presses can have a relatively
high total indicated readout (TIR) & marginal gripping power.
I upgraded all my drill presses with Jacobs chucks (USA).
Shown is a Jacobs taper (JT-33), heavy duty, 0" ~ ½" (0mm ~ 13mm),
keyed chuck on the bench drill press. The extra large jaws & key,
coupled with high quality, totally eliminated any drill bit slippage.
A Dewalt split-tip ¼" jobbers drill bit is chucked-up.
Bench drill press with a replacement Jacobs chuck. Drill press exploded diagram.
CAUTION: Always clamp
the piece to the table before drilling. Do not hold by hand.
Standard drills will grab soft metals like brass, lift the
work piece, even with a
small vise, and dangerously spin them at high speed. Clamp or
bolt down the piece.
Make sure the drill press table is locked onto the column, too.
Using a mill with fine down feed is a better method to drill soft metals.
Adjustable drill-press fence.
Also shown is the replacement chuck for a
floor-standing, 16 speed, 16.5" swing,
Jet
drill press.
The low, 200 RPM speed is good for the drilling larger holes. Its
uses
a
removable MT-2
(Morse taper) to
JT-3 chuck arbor. This type of arbor arrangement
allows the mounting of a
Jacobs ball bearing Super Chuck, ⅛" ~
⅝" (3mm ~ 16mm).
The low-cost chuck arbors come in a large number of
size combinations allowing
one to adapt almost any chuck
to a given spindle. For example, I obtained an MT-2 to
JT-33 arbor (Enco) to allow mounting the
smaller Jacobs chuck since it can hold smaller
drill bits in the range of
0" ~
⅛" (0mm ~ 3mm). Use the proper cutting fluid
when drilling metals.
I made an
adjustable work-stop peg that fits into the table slot.
Jet JDP-17 drill press manual
The Jacobs Super Chuck is of superior quality having low a TIR & the ball bearing design allowing very high gripping power.
Jet drill press mortising attachment (JMA-581 manual), installed.
The picture shows a ViseGrip
drill press hold down clamp. A
Royal micro-sensitive feed attachment with a
Jacobs JT0 keyed chuck (0" ~ 5/32") for small hole
drilling (from Enco). Its straight
shank is ½" in diameter;
overall drill travel is ¾". Use the highest RPM. Hold
the aluminum ring between your fingers.
It is mounted
in a ball bearing to decouple it
from the rotating shaft. Apply light
downward pressure. It
has far less drilling
pressure than
the drill press rack & pinion. An internal
coil spring
automatically retracts the chuck.
Jacobs keyed chuck (USA), 0 to ¼" (0 to 6.5mm) with a 2JT - ⅜"-24 threaded arbor.
Jacobs keyed chuck (USA), 0 to 5/32" (0 to 4mm) with a Royal 0JT - ½" micro-sensitive feed attachment.
Albrecht precision keyless chuck (Germany), 0 to ⅛" (0 to 3mm) with a 0JT - ½" arbor.
Enco has these chucks & 0JT arbors at good prices.
Albrecht precision keyless chuck (Germany), 0 to 0.06" (0 to 1.5mm) with a 0JT - ⅜" arbor.
The slots for both the bench & floor drill presses require ⅝" T-Nuts using ½" studs.How to drill a hole Drill bits, reamers & counter bores
